HK26891A - Privacy signal transmission system - Google Patents

Privacy signal transmission system

Info

Publication number
HK26891A
HK26891A HK268/91A HK26891A HK26891A HK 26891 A HK26891 A HK 26891A HK 268/91 A HK268/91 A HK 268/91A HK 26891 A HK26891 A HK 26891A HK 26891 A HK26891 A HK 26891A
Authority
HK
Hong Kong
Prior art keywords
signal
digital
analog
privacy
modulator
Prior art date
Application number
HK268/91A
Other languages
German (de)
English (en)
French (fr)
Inventor
Kouzou Kage
Original Assignee
Nec Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nec Corporation filed Critical Nec Corporation
Publication of HK26891A publication Critical patent/HK26891A/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B14/00—Transmission systems not characterised by the medium used for transmission
    • H04B14/02—Transmission systems not characterised by the medium used for transmission characterised by the use of pulse modulation
    • H04B14/04—Transmission systems not characterised by the medium used for transmission characterised by the use of pulse modulation using pulse code modulation
    • H04B14/046—Systems or methods for reducing noise or bandwidth
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
    • H04K1/00—Secret communication

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Transmission Systems Not Characterized By The Medium Used For Transmission (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Transmitters (AREA)
HK268/91A 1982-12-22 1991-04-11 Privacy signal transmission system HK26891A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP57223892A JPS59115640A (ja) 1982-12-22 1982-12-22 秘話信号伝送方式

Publications (1)

Publication Number Publication Date
HK26891A true HK26891A (en) 1991-04-19

Family

ID=16805338

Family Applications (1)

Application Number Title Priority Date Filing Date
HK268/91A HK26891A (en) 1982-12-22 1991-04-11 Privacy signal transmission system

Country Status (9)

Country Link
US (1) US4841571A (enrdf_load_stackoverflow)
EP (1) EP0111937B1 (enrdf_load_stackoverflow)
JP (1) JPS59115640A (enrdf_load_stackoverflow)
KR (1) KR860002153B1 (enrdf_load_stackoverflow)
AU (1) AU582532B2 (enrdf_load_stackoverflow)
CA (1) CA1204188A (enrdf_load_stackoverflow)
DE (1) DE3379627D1 (enrdf_load_stackoverflow)
HK (1) HK26891A (enrdf_load_stackoverflow)
SG (1) SG8391G (enrdf_load_stackoverflow)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5103459B1 (en) * 1990-06-25 1999-07-06 Qualcomm Inc System and method for generating signal waveforms in a cdma cellular telephone system
US6693951B1 (en) 1990-06-25 2004-02-17 Qualcomm Incorporated System and method for generating signal waveforms in a CDMA cellular telephone system
US5214787A (en) * 1990-08-31 1993-05-25 Karkota Jr Frank P Multiple audio channel broadcast system
US5347542A (en) * 1991-06-28 1994-09-13 Motorola, Inc. Demodulation selection for a communication signal
US5255269A (en) * 1992-03-30 1993-10-19 Spacecom Systems, Inc. Transmission of data by frequency modulation using gray code
DE19530393A1 (de) * 1995-08-18 1997-02-20 Antonius Dr Rer Nat Klingler Verfahren zur vocoderlosen Ver- und Entschlüsselung von analogen und digitalen Kommunikationssignalen auf der Basis deterministisch erzeugten Rauschens
US6678311B2 (en) 1996-05-28 2004-01-13 Qualcomm Incorporated High data CDMA wireless communication system using variable sized channel codes
US5926500A (en) 1996-05-28 1999-07-20 Qualcomm Incorporated Reduced peak-to-average transmit power high data rate CDMA wireless communication system
WO1998052318A1 (en) * 1997-03-14 1998-11-19 Mobile Broadcasting Corporation System and method of data transmission in the am frequency spectrum
JPH11295439A (ja) * 1998-04-07 1999-10-29 Ishida Co Ltd 異物検出機および異物検出システム
JP2008177632A (ja) * 2007-01-16 2008-07-31 Oki Electric Ind Co Ltd 無線音声通信回路
US9520920B2 (en) * 2014-10-27 2016-12-13 Avago Technologies General Ip (Singapore) Pte. Ltd. Transmitting and receiving digital and analog signals across an isolator using amplitude modulation
EP4127620A4 (en) * 2020-03-30 2023-09-06 Blackbox Biometrics, Inc. ACOUSTIC MONITORING SYSTEMS AND METHODS

Family Cites Families (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2283575A (en) * 1938-04-19 1942-05-19 Rca Corp High frequency transmission system
US2399469A (en) * 1940-07-31 1946-04-30 Gen Electric Secret signaling system
US2527561A (en) * 1947-04-30 1950-10-31 Farnsworth Res Corp Selective calling system
US3048781A (en) * 1957-12-26 1962-08-07 Bell Telephone Labor Inc Reduction of quantizing error in quantized transmission systems
US3173092A (en) * 1961-11-15 1965-03-09 Automatic Elect Lab Delta modulation system
US3273141A (en) * 1963-03-19 1966-09-13 Ball Brothers Res Corp High speed analog-to-digital converter
GB1095457A (enrdf_load_stackoverflow) * 1965-09-21
NL151593B (nl) * 1966-11-22 1976-11-15 Philips Nv Stelsel voor signaaloverdracht met behulp van pulsdeltamodulatie.
US3571758A (en) * 1967-05-12 1971-03-23 Westinghouse Electric Corp Method and apparatus for adaptive delta modulation
JPS5114846B1 (enrdf_load_stackoverflow) * 1968-08-08 1976-05-12
US4008435A (en) * 1972-05-30 1977-02-15 Nippon Electric Company, Ltd. Delta modulation encoder
US3784743A (en) * 1972-08-23 1974-01-08 Bell Telephone Labor Inc Parallel data scrambler
FR2209260B1 (enrdf_load_stackoverflow) * 1972-10-10 1975-03-28 Radio Diffusion Tv Francaise
NL165014C (nl) * 1973-09-03 1981-02-16 Philips Nv Transmissiestelsel met een zender en een ontvanger voor het met behulp van een pulscode overdragen van informatiesignalen.
DE2355676C3 (de) * 1973-11-07 1979-01-18 Standard Elektrik Lorenz Ag, 7000 Stuttgart Schaltungsanordnung zur Übertragung von Signalen mit Differenz-Pulscodemodulation (DPCM)
NL174611C (nl) * 1975-06-12 1984-07-02 Philips Nv Differentieel pulscodemodulatie overdrachtstelsel.
GB1558452A (en) * 1976-12-20 1980-01-03 Japan Broadcasting Corp Analogue to digital converting device
JPS6016777B2 (ja) * 1976-12-25 1985-04-27 株式会社東芝 信号伝送方式
JPS547205A (en) * 1977-06-20 1979-01-19 Nippon Telegr & Teleph Corp <Ntt> Privacy circuit
JPS5511638A (en) * 1978-07-11 1980-01-26 Nec Corp Privacy circuit
US4295223A (en) * 1979-04-25 1981-10-13 Westinghouse Electric Corp. Digital signal/noise ratio amplifier apparatus for a communication system
FR2481026B1 (enrdf_load_stackoverflow) * 1980-04-21 1984-06-15 France Etat
JPS58198934A (ja) * 1982-05-17 1983-11-19 Sony Corp 秘話装置
JPS5922208A (ja) * 1982-07-06 1984-02-04 Victor Co Of Japan Ltd デイジタル情報信号記録方式

Also Published As

Publication number Publication date
SG8391G (en) 1991-04-05
CA1204188A (en) 1986-05-06
EP0111937B1 (en) 1989-04-12
KR860002153B1 (ko) 1986-12-11
JPS59115640A (ja) 1984-07-04
KR840007335A (ko) 1984-12-06
DE3379627D1 (en) 1989-05-18
AU582532B2 (en) 1989-04-06
US4841571A (en) 1989-06-20
EP0111937A2 (en) 1984-06-27
EP0111937A3 (en) 1987-01-21
AU2255483A (en) 1984-06-28
JPH0245856B2 (enrdf_load_stackoverflow) 1990-10-12

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Legal Events

Date Code Title Description
PC Patent ceased (i.e. patent has lapsed due to the failure to pay the renewal fee)